Metal pump



u 4, 1931. H. A. w. WOOD 4 1,816,946

METAL PUMP Filed June 30, 1927 2 Sheets-Sheet l 4, 1931- I H. A. w. WOOD 1,816,946

METAL PUMP Filed June 50, 1927 2 Sheets-Sheet 2 Patented Aug. 4, 1931 I nam STATES HENRY; A. 'VWISE W001), or' ivnw YORK, 1v. Y., essienon T woon NEWSPAPER PATENT orrics MACHINERY CORPORATIONQOF NEH/"YORK, N. Y., ACORIORATIQN OF VIRGINIA METAL run? Application filed June 30,

'ten metal in a chamber connected With the I pump and spout. 'Forthis purpose the invention also, involves'means for constantly feeding metal into said chamber from the inelting p ot and through the-chamber to the pump barrel. r 1

Other, ob'ects and advantages of the invention Willappearhereinafter. 1 Reference is to be hadto the accompany- 'ing dravvings,in which a Fig.1 is a plan of a pump constructedin accprda-nceiwith this invention Fig.2 is a sectional view on the line22 off Fig. 15' and Fi s 8 and 4:v are similar sectional views D t shoW'ing f'modifications coming ithin, the

s'cope of this invention. I I 1 In automatic stereotype machines it is desirablejthat thefsame quantity of molten metal be delivered With each stroke of the pump. Attempts have been made to do this by improying the.construction-ofthe piston and pump barrel and controlling thestroke,

. ',but these improvements fail to prevent some variation in the amount of. metal delivered,

due to thevarying levelof the molten metal in the melting pot and therefore in the bar- ;r'el andspout. V 1 3 ,In ordinarypumps the level of the metal Within the, pump, at the beginning of its op- AQerating stroke, is the: same as'the level of the metal in thepot in vvhichf the.pum pis located. Dillerences in this levelnecessarily .vary theamount delivered from the spout. Although a constant amount of metal'is displaced by the pump at each stroke, a certain portion of itis returned to the pump with return of theP-piston. That portion is governed by the quantity of metal contained within the spoutbetween'its hi hest point 59 near the delivery and the normal evel ot-the and connections 7. connected with the cam of an automatic plate casting machlne, not illustrated herein.

1927. Serial No. 2o2,5s4.

metal Within the pot. It is impossible to maintain a constantlevel in the melting pot itself on account of the Withdrawal of the metal at each operation and the replenishing of the metal. This invention is designed to compensate for this variation in an automatic pump. I I

Referring first to Figs. 1 and 2, an ordinary melting pot 2 is illustrated having a pump barrel 1 therein. The pump is provided With a delivery spout 3' for the usual purpose. In the pump is a piston 4; having perloratlons or ports 9 therethrough, and a piston rod 5 which is operated by a lever 6 The latter is as usual The piston l is loose on a reduced portion of the piston rod 5." Fixed on the end of that rod is a valve 8 adapted to close the ports 9 at certain times as Will appear. i sintroduced into the pump barrel 1 through an inlet 10 which is controlled by a valve 11 freely mounted on a stem and adapted to move up and down with the current of liquid metal. a

Themetal is supplied to the pump barrel through this inlet 10 by a pump, as for example, an ordinary gear pump 12. This pump. isdriven from a suitable'source of power constantly by a chain 13, preferably operated by the plate casting machine. The metal is delivered from the gear pump through a conduit l l into a chamber 15 directly above the pump barrel and containing in its bottom the inlet 10. This. chamber is provided With an over-flow conduit 16 large enough to take care of the metal delivered to the chamber. Therefore, the metal is maintained at a-constant level by this over-flow conduit, as shown in Fig.2, irrespective of any changes in the level of the molten metal in the pot. a p

,1 When the connection 7 is pulled downward by the operation of the casting machine, the 'pistonrod 5 of course, moves up and takes .With it the valve 8. .This valve is pressed up against the bottom of the piston 4 and closes the ports 9 and then lifts, the piston. This, of course, forces the entire body of metal The .metal above the piston upwardly. This flow immediately closes the valve 11 so that the entire I body of metal is forced into the spout. When the piston is in the position shown in Fig. 2,

the inlet valve being open, the metal'in the pump barrel is in communication with that contained in the chamber 15 so that a constant level is maintained. The same level is maintained in the spout. Therefore, regardless of the amount of metal in the melting pot 2, the

metal in the pump and spoutis always kept constant. From this it follows thatthe quantity of metal discharged with each operation of the piston is independent'of thelevel of the metal in the melting pot 2.

In the form shown in Fig. 3,, some of the parts above described are shown'in the same arrangement, but instead of the gear pump I have shown an additional piston 19 below the lpistQn 4 and in alignment'with it. This pistou 19. 1. located in an auxiliary pump barrel 18 beneath the pump barrel 1. This necessitates the raising of the pump barrel l with its delivery. and return conduits somewhat higher in the melting pot; V

. The piston19 is provided with ports20 and a valve '21 attached to, the lower end of the piston rod 5 a The piston & is provided with the "ports 9 and valve 8 to permit this piston to descend without any back pressure which might be developedby-the metal contained beneath it on account of leakage around the The Inetal andthe pistonl9.isdrawn upwardly after a slight dwell. This piston 19 thereby sucks metal into the chamberbeneath it through inlet port'22, in the bottom of the 'barrelj18, On the return stroke ofthe piston rod, the valve 23is closedb'y'the action of the piston.

piston 4 moves upwardly to discharge pressure of the metal above it, and the, metal containedin the barrel l8, isiforcedthrough a conduit25, This metal runs over into the a r 5 and hvrqi ghth let port 10 in the barrel as before, 'This keeps the, level in the-chamber 1511p. to the bottom of thecond 1 a v s atei In. this ca e th bott m of 1 hel u r p p barrel18 i elose 'ex entfor the valve and ports, andalso the bottom of "the pump barrel l-isclosed the topo'f the bar l' i-z In the form bow n F g? th a ran emay; i'ssimilar except tan. ar'ix l ary Piston'2'6 is placed alongside ofthe l iil barrel 1 [and is operated by a reversinglever 24 which 7 s connected W 'the e ther by:

, PiS -Qi i od nd Ope h s s mb difire t arrangernent of the parts, but the operauqn is -.'the same, t e v l e taking the. P ace, 'of

vious, Q g 1 In all h se o ms the vary ng e l f metal'i'n the meltingfpot are compensated for va ve; 3;; he" ed tative;otherw se f obby maintaining a constant level in the chamber above the pump barrel. This latter chamber surrounds the pump and spout and communicates with them through the inlet 10, thus making the amount of delivery independent of variations in the level of the metal within the melting pot.

Although Ihave illustrated anddescribed only three forms of the invention,I am aware ofthe fact that other changes can be made therein by any person skilled in the art Without departing from the scope of the invention as expressedxin theclaims. Therefore I do not .wish to be limited to the exact form shown, but what I do claim is:

1. In a pump for delivering molten metal, the combination with a pump barrel, a piston in the barrel for raising the metal therein and delivering it, a chamber-above the pump barrel for receiving the metal and delivering it into the barrel, and means for keeping the level of the molten metal and its volume in said chamber constant when the pump is not pumping metal.

2. In apump for delivering molten metal, the combination with a pump barrel and means for introducing-metal into the barrelifromabove, of a, piston in the "barrel for raising the metal therein and delivering it, and a chamber .extendingabove th barrel having an outlet by which thelevel of the molten metal in saidchamber is rendered constant, said chamber being located in position for receiving the metal-before it is introduced in o, h pump barrel.

' 3. In a pump for delivering molten metal, the combination with a barrel, a piston therein," and meansfo-roperating the piston to force the metal from thebarrel to discharge it, ofmeans for forcing molten metal into the barrel, and a chamber above the bar-rel 1 chamber having an outlet of large capacity,

whereby the level of metal in the chamber will remain constant at the bottom oflsaid outlet 14;; In a pump for delivering molten metal, the combination with a barrel, a piston there- 'Qn, n means fo oper i g th pis o to force the metal from the barrel to discharge it, of means for forcing molten metal from a melting pot into the barrel, said barrel hav- '.'ing portfthrough which the metalcan escape into it, and-a chambenabove the barrel receiving the metal" flcOm said forcing means and discharging through said port into the barrel, saidchamber having an outlet of large capacity, whereby the level of metal inv the chamber will remain constant irrespective of the level of metal in'thepot outside the pump barrel. V

5. In a device of the character described,

the'combination with amelting pot, of a pump located therein projecting down into the molten metal in the pot, said pump comprising a barrel extending below the metal in the pot, a piston in the barrel, means for operating the piston, a chamber on the top of the barrel, a port in the bottom of the chamber leading into'the barrel, a valve for automatically closing the port when the piston is raised, said chamber having an outlet capable of carrying away the metal introduced into it and adapted to insure a constant level of the metal in the chamber, and means forintroducing metal from the pot into said chamber. a

6. In a device of the character described, the combination with a melting pot, of a pump located therein, said pump comprising a barrel, a piston in the barrel, means for operating thepiston, achamber on the top of the barrel, a port in the bottom of the chamber leading into the barrel, said chamber having an outlet capable of carrying away the metal introduced into it to insure a constant level of the metal in the chamber, and means for introducing metal from the pot into said chamber;

7. In a device of the character described, the combination with a melting pot, of a pump located therein, a chamber at the top of the pump, a port in the bottom of said chamber, an outlet from the chamber capable of carrying away the metal introduced into the chamher to insure a constant level of the metal in the pump.

In testimony whereof I have hereunto affixed my signature.

HENRY A. WISE WOOD. 

